CVE-2024-21389 - Microsoft Dynamics 365 (on-premises) Cross-site Scripting Vulnerability: Understanding, Identifying, and Mitigating the Risks

In an age where businesses rely heavily on cloud platforms for streamlining their operations, protecting crucial data from vulnerabilities is of utmost importance. This informative post discusses the recently discovered cross-site scripting (XSS) vulnerability (CVE-2024-21389) that affects Microsoft Dynamics 365 on-premise installations. We'll walk you through the intricacies of this potential threat, its exploit, available patches, and security practices you can implement to mitigate harm to your organization's data.

Understanding CVE-2024-21389

The Common Vulnerabilities and Exposures (CVE) identifier CVE-2024-21389 is assigned to a specific XSS vulnerability in Microsoft Dynamics 365 (on-premises) version 8.x and 9.x up to version 9.1. As a widely used business application platform designed for enterprise resource planning and customer relationship management, Microsoft Dynamics 365 is an ideal target for cybercriminals looking to exploit vulnerabilities and gain unauthorized access to data.

This XSS vulnerability allows attackers to inject malicious scripts into web pages, giving them access to sensitive information such as user credentials, cookies, and personal data. They may also be able to perform actions on the user's behalf, leading to unauthorized updates or data manipulation.

Description of the vulnerability and its exploit

The root cause of this vulnerability lies in Microsoft Dynamics 365's improper input validation - enabling attackers to insert and execute malicious JavaScript code through specific fields in the application.

Attacker creates a specially crafted URL containing malicious JavaScript code

https://vulnerable-dynamics-instance.com/main.aspx?etc=1&id=%7bGUID%7d&pagetype=entityrecord&extraqs=%3cimg%20src=x%20onerror=alert%28%27XSS%27%29%3e

Victim clicks on the specially crafted link sent by the attacker, initiating the process.

3. The malicious JavaScript code gets executed in the user's browser, stealing sensitive information and performing unauthorized actions.

Details on how an attacker can acquire the correct URL and fields to target can be found in the original advisory links provided later in this post.

Links to original references and advisories

The official CVE details can be found in the National Vulnerability Database. Additional information, including technical advisories and discussions related to this vulnerability, are available at:

- Microsoft Security Response Center (MSRC)
- CISA Advisory

Mitigation measures and best practices

Microsoft has already provided patches for this vulnerability in their latest security updates. To protect your organization's data and resources, it is highly advised that you:

1. Apply the latest security updates for Microsoft Dynamics 365 (on-premises).

Provide regular security training for your team members.

3. Stay updated on the latest security advisories and make sure to patch vulnerabilities as soon as possible.

Conclusion

The CVE-2024-21389 vulnerability highlights the persistent risks associated with web applications. Understanding how to identify, assess, and mitigate such vulnerabilities is vital for maintaining the security posture of your organization. By following the best practices outlined in this post, you can take essential steps to protect your valuable data and resources from potential cyber threats.

We hope this post has provided you with exclusive insights into this critical vulnerability and ways to protect your organization. Stay secure!

Timeline

Published on: 02/13/2024 18:15:56 UTC
Last modified on: 02/23/2024 17:39:57 UTC